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PBS Space Time

Why the Universe Needs Dark Energy

Season 2 Episode 27 | 9m 33s

We know the universe will continue to expand forever, so now we can begin to complete the first Friedmann equation, and determine the shape and geometry of our universe. At first glance, it would seem that the equation doesn’t quite add up, and that our universe is a hyperbolic plane. But when we add in the cosmological constant, the equation balances out, and we return to a flat universe.

Aired: 04/19/16
Extras
Watch • 17:21
PBS Space Time
Are The Fundamental Constants Finely Tuned? | The Naturalness Problem
Did God have any choice in creating the world? So asked Albert Einstein
Episode: S11 E7 | 17:21
Watch • 18:19
PBS Space Time
The Crisis In Physics: Are We Missing 17 Layers of Reality?
What if, just before we reach the bottom, we find out that reductionism fails?
Episode: S11 E6 | 18:19
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Watch • 17:21
PBS Space Time
Are The Fundamental Constants Finely Tuned? | The Naturalness Problem
Did God have any choice in creating the world? So asked Albert Einstein
Episode: S11 E7 | 17:21
Watch • 18:19
PBS Space Time
The Crisis In Physics: Are We Missing 17 Layers of Reality?
What if, just before we reach the bottom, we find out that reductionism fails?
Episode: S11 E6 | 18:19